Dan Gohman 4b35f83b91 Teach LoopSimplify how to merge multiple loop exits into a single exit, ... when one of them can be converted to a trivial icmp and conditional branch. This addresses what is essentially a phase ordering problem. SimplifyCFG knows how to do this transformation, but it doesn't do so if the primary block has any instructions in it other than an icmp and a branch. In the given testcase, the block contains other instructions, however they are loop-invariant and can be hoisted. SimplifyCFG doesn't have LoopInfo though, so it can't hoist them. And, it's important that the blocks be merged before LoopRotation, as it doesn't support multiple-exit loops. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74396 91177308-0d34-0410-b5e6-96231b3b80d8		2009-06-27 21:30:38 +00:00
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Analysis	Add a testcase demoing some of ScalarEvolution's new trip count logic.	2009-06-24 01:22:30 +00:00
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CodeGen	factor some logic out into a helper function, allow remat of loads from constant	2009-06-27 04:38:55 +00:00
DebugInfo	upgrade	2009-06-23 22:11:37 +00:00
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Feature	Let's ignore MDStrings also!	2009-06-26 02:26:12 +00:00
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MC/AsmParser	MC: Parse .org directives.	2009-06-25 22:44:51 +00:00
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Transforms	Teach LoopSimplify how to merge multiple loop exits into a single exit,	2009-06-27 21:30:38 +00:00
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Makefile	Clarify how to configure llvm-gcc-4.2 for use with	2009-06-26 05:44:53 +00:00
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